Sun blinds, whether of the traditional awning kind or of the
modern metal roller type, provide welcome shade in the
summer and , in the case of the latter, also good protection
against break-ins. Many of these blinds are operated
by an electric motor. The control described closes the blinds
when it gets dark outside and opens them again when daylight
returns. This automatie operation can be overridden
bya manually operated switch, so that the blinds can be
opened or closed at any time of the day as required.
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